Fix some small casing issues

[matthchr]

• Rename ApiVersion to APIVersion.
• Rename GetId to GetID.

[codecov-commenter]

Codecov Report

Merging #1561 (8ae905b) into master (cc87f74) will increase coverage by 0.00%.
The diff coverage is 95.83%.

@@           Coverage Diff           @@
##           master    #1561   +/-   ##
=======================================
  Coverage   63.38%   63.38%           
=======================================
  Files         176      176           
  Lines       11669    11670    +1     
=======================================
+ Hits         7396     7397    +1     
  Misses       3609     3609           
  Partials      664      664           

Impacted Files	Coverage Δ
hack/generated/pkg/genruntime/base_types.go	96.55% <ø> (ø)
...ted/pkg/reconcilers/azure_deployment_reconciler.go	59.39% <75.00%> (ø)
...ces/v1alpha1api20200601/resourcegroup_arm_types.go	100.00% <100.00%> (ø)
...sources/v1alpha1api20200601/resourcegroup_types.go	43.47% <100.00%> (ø)
hack/generator/pkg/astmodel/arm_spec_interface.go	91.39% <100.00%> (ø)
...l/armconversion/convert_to_arm_function_builder.go	87.36% <100.00%> (ø)
hack/generator/pkg/astmodel/identifier_factory.go	100.00% <100.00%> (ø)
hack/generator/pkg/astmodel/resource_type.go	71.00% <100.00%> (ø)
...g/codegen/pipeline_add_arm_conversion_interface.go	63.93% <100.00%> (ø)

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[theunrepentantgeek]

LGTM